U.S. patent application number 14/172858 was filed with the patent office on 2015-08-06 for asphalt additive.
This patent application is currently assigned to Innophos, Inc.. The applicant listed for this patent is Innophos, Inc.. Invention is credited to Jean Valery Martin.
Application Number | 20150218378 14/172858 |
Document ID | / |
Family ID | 53754276 |
Filed Date | 2015-08-06 |
United States Patent
Application |
20150218378 |
Kind Code |
A1 |
Martin; Jean Valery |
August 6, 2015 |
ASPHALT ADDITIVE
Abstract
The present disclosure relates to an additive for asphalt
production, comprising phosphoric acid, polyphosphoric acid or
mixtures thereof, and an alcohol. In some embodiments, the alcohol
is glycerol.
Inventors: |
Martin; Jean Valery;
(Princeton, NJ) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Innophos, Inc. |
Cranbury |
NJ |
US |
|
|
Assignee: |
Innophos, Inc.
Cranbury
NJ
|
Family ID: |
53754276 |
Appl. No.: |
14/172858 |
Filed: |
February 4, 2014 |
Current U.S.
Class: |
106/284.1 ;
106/503 |
Current CPC
Class: |
C08L 95/00 20130101;
C08K 5/053 20130101; C08K 5/521 20130101; C08K 5/52 20130101 |
International
Class: |
C08L 95/00 20060101
C08L095/00; C08K 5/52 20060101 C08K005/52; C08K 5/521 20060101
C08K005/521; C08K 5/053 20060101 C08K005/053 |
Claims
1. An additive for asphalt production, comprising (i) phosphoric
acid, polyphosphoric acid or mixtures thereof, and (ii) an
alcohol.
2. The additive of claim 1, wherein the alcohol is glycerol.
3. A method for improving asphalt production, comprising the step
of: (i) combining an additive of claim 1 to an asphalt mix, wherein
a warm mix additive/adhesion promoter is formed.
4. The method of claim 3, wherein the promoter is an ester of
phosphoric acid.
5. The method of claim 3, wherein the mixing and compaction
temperature of the asphalt mix is reduced.
6. The method of claim 3, wherein the moisture resistance of the
asphalt mix is increased.
7. The method of claim 3, wherein the useful temperature interval
of the asphalt mix is increased.
Description
FIELD OF THE INVENTION
[0001] The present disclosure relates to an asphalt additive
comprising phosphoric acid and an alcohol. The present disclosure
also relates to a method of combining the additive to an asphalt
mix. The additive promotes the in situ production of warm mix
additive(s) in the asphalt mix. The presence of a warm mix
additive(s) reduces the mixing and compaction temperature of
asphalt mix materials.
BACKGROUND OF THE INVENTION
[0002] There is an increasing concern in the asphalt industry about
carbon emissions. The asphalt industry is actively seeking to
decrease the production of such carbon emissions. The asphalt
industry is also concerned with reducing energy cost. Both of these
concerns have been driving the asphalt industry for the past 10
years.
[0003] As a result of such concerns, the asphalt industry has
employed various processes to reduce both carbon emissions and
energy costs. One such process seeks to reduce the mixing and
compaction temperatures used with asphalt mixes. The process,
called "warm mix", uses lower temperatures in processing the
asphalt mix. The use of lower temperatures, however, increases flow
resistance. Therefore, the process also involves the addition of
water, chemical additives or mixtures of both to reduce the flow
resistance of the mix when processed at the lower temperature.
[0004] The addition of water typically requires the co-addition of
an adhesion promoter to enhance the moisture resistance of asphalt
mixes. The addition of chemical additives, including adhesion
promoters, usually combine two functionalities (i) adhesion
promotion and (ii) lubrication, to reduce the mixing and compaction
temperature. Among the chemical additives used as adhesion
promoters or warm mix additives are organic esters of phosphoric
acid.
[0005] The addition of chemical additives significantly increases
the asphalt mix price. The present disclosure relates to an
alternative way to introduce warm mix additives/adhesion promoters
into the asphalt mix to reduce the mixing and compaction
temperature while not significantly increasing overall cost. This
alternative method involves the production of the suitable chemical
additives in situ while the asphalt is handled at a refinery or
terminal.
SUMMARY OF THE INVENTION
[0006] The present disclosure relates to an additive for asphalt
production, comprising phosphoric acid, polyphosphoric acid or
mixtures thereof, and an alcohol. In some embodiments, the alcohol
is glycerol.
[0007] The present disclosure also relates to a method for
improving asphalt production, comprising the step of combining an
additive as described herein to an asphalt mix, wherein a warm mix
additive/adhesion promoter is formed. In some embodiments, the
promoter is an ester of phosphoric acid, or similar molecule.
[0008] The addition of the asphalt additive to an asphalt mix may
result in a reduction of mixing and compaction temperatures from
those typically used when preparing asphalt for raad pavements, an
increase in the moisture resistance of asphalt mix, and/or an
increase in the UTI (Useful Temperature Interval) of the asphalt or
asphalt mix.
[0009] The useful temperature interval of asphalt is the
differential, or spread in temperature, between the high
temperature grading and the low temperature grading.
[0010] The use of phosphoric acids, e.g. polyphosphoric acid, is
known in the asphalt industry. Phosphoric acids belong to a
distinct family of chemical additives used to improve the stiffness
of the asphalt at high temperature in order to provide a higher
resistance to rutting to the asphalt mix produced with it.
Phosphoric acids, and in particular phosphoric acids combined with
an alcohol, have not been used to form in situ warm mix
additive/adhesion promoter in asphalt mixes.
[0011] Conventional hot mix asphalt may be mixed at temperatures
exceeding 300.degree. F., e.g. 300-325.degree. F., and may be paved
and/or compacted at temperatures 5-20.degree. F. cooler than the
mix temperature. These temperatures, and other temperatures recited
herein, may vary as a function of the starting asphalt grade
material, related materials and other conditions.
[0012] The adhesive additive of the present disclosure may provide
compositions that may be mixed with aggregate at temperatures
30-50.degree. F. lower than, or more than 50.degree. F. lower than,
or as much as 100.degree. F. lower than a substantially similar
asphalt compositions, binder or cement that does not contain the
adhesive additive. Similarly, the asphalt/aggregate mixtures can be
compacted at temperatures 30-50.degree. F. lower than, or more than
50.degree. F. lower than, or as much as 100.degree. F. lower than a
substantially similar asphalt/aggregate mixture that does not
contain the adhesive additive.
* * * * *